Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with afirst image in a sequence for an animated graphical user interface; and,

FIG. 2 is a front view of a display screen or portion thereof with asecond image in a sequence for an animated graphical user interface.

The outermost broken lines illustrate a display screen or portionthereof and form no part of the claimed design. The remaining brokenlines, illustrating portions of the animated graphical user interface,form no part of the claimed design. The appearance of the imagetransitions sequentially between the images shown in FIGS. 1-2. Theprocess or period in which one image transitions to another forms nopart of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof withan animated graphical user interface, as shown and described.